CH302 Exam 1 TA Style
1. Rearrange the Gibbs free energy equation (
G
=
H

T
S)
to solve for the temperature at a phase
transition.
a.
T
= (
H

G)/
S
b.
T =
H/
S
c.
T = 
G
d.
T = 
G/
S
2. What will happen to vapor pressure when nonvolatile solute A is added to a pure solution
B?
a.
Vapor pressure of A increases
b.
Vapor pressure of B decreases
c.
Vapor pressure doesn't change
d.
Boiling point decreases of A inrcreases.
e.
Boiling point of B decreases
3. Which of the following is a possible combination of values for
∆
H
lattice
,
∆
H
hydration
and
∆
H
solution
. All values are in kJ&mol
1
.
a. 12, 22, 34
b. 67, 9, 58
c. 31, 18, 49
d. 47, 43, 4
4. Which of the following is always true for phase diagrams?
a.
The slope of the melting curve is always positive.
b.
The slope of the condensation curve is always negative.
c.
There are exactly 3 phases for all chemicals.
d.
When going from left to right on the graph, pressure and temperature both increase
along the condensation curve.
e.
The critical point is located above 400 K.
5. At what temperature will water boil on top of a mountain if the normal boiling point is
100 °C at 1 atm. (You should not need to look at this graph to answer the question)
a.
Below 100 °C
b.
At 100 °C
c.
Above 100 °C
d.
Water will not boil on top of a mountain.
6. Consider a 27 g sample of ice at 1 atm. Initially, the sample is frozen at 20 °C. How
much heat must be added to the sample for it to become a liquid at 78 °C. Heat capacity of
ice: 2 J/gK. Heat capacity of water: 4 J/gK.
∆
H of melting: 330 J/g
a.
9.5 kJ
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18.4 kJ
c.
5.3 kJ
d.
10.6 kJ
7. As the temperature of a solvent (increases/decreases), the solubility of (some/all) gases
increases.
a.
decreases, all
b.
increases, some
c.
decreases, some
d.
increases, all
8. Rank the following liquids from least to most miscible in H
2
O
2
:
H
2
O, C
2
H
6
, CH
2
Cl
2
a.
H
2
O, CH
2
Cl
2
, C
2
H
6
b.
CH
2
Cl
2
, C
2
H
6
, H
2
O
c.
C
2
H
6
, H
2
O, CH
2
Cl
2
d.
C
2
H
6
, CH
2
Cl
2
, H
2
O
9. For the equations presented in this class, the Clausius Clapeyron equation looks a lot like
the van’t Hoff equation and in fact, the van’t Hoff equation is a more general form of the
same equation.
Which of the following is an intelligent statement about how the two
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 Spring '07
 Holcombe
 Thermodynamics, pH, Vapor pressure, Hoff

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